Leak-Proof Water Blob Provides Hours of Fun

leak proof water blob

With the warm weather slowly creeping back it’s time to think of warm summer days, and with that comes this rather interesting leak-proof water… blob?

[Leisha] over at Homemade Toast has come up with a super inexpensive way to make a water blob  – or a giant outdoor waterbed? It certainly looks cool, and apparently keeps children entertained for hours playing on it. We wonder how bouncy you could make one for bigger kids (i.e. us).

It’s made out of a roll of painter’s plastic drop sheet, and instead of trying to tape, glue or otherwise seal the edges, [Leisha's] figured out an easy way to melt the seams together using a clothes iron. By sandwiching parchment paper over the two pieces of plastic, you can gently run the iron along the edge, creating a very strong bond, without melting a hole in the plastic.

Seriously — we want to see someone make a giant version of this for some extreme waterbed bouncing!

[via Viral Nova]

PenguinBot Follows Light, Goes Screech in the Night

The Arduino Based Penguin Robot
Ever have one of those weekend that projects take on a life of their own? [Michael] did, and the result is this PenguinBot. While [Michael's] wife was away for the weekend he happened upon a broken toy penguin. The batteries had leaked inside, destroying the contacts. Rather than bin the toy, [Michael] made it awesome by turning it into an autonomous robot. [Michael's] goal was to create a robot that could roam around the house avoiding obstacles, or follow a light source like a flashlight.

He started by pulling out most of the original electronics. Two dollar store toy trains gave their lives and their motors to replace the penguin’s original drive system. An Arduino Pro Mini became PenguinBot’s brain. Sensors consisted of two light sensing CdS cells, an AdaFruit sound sensor, and a MaxBotix ultrasonic sensor. With the ultrasonic sensor mounted on a servo, it can detect obstacles in any direction. The CdS cells and some software will allow PenguinBot to follow lights, like any good photovore robot should.

Click past the break to see PenguinBot in action

[Read more...]

Low-Power Orientation Tracker and an Optimized Math Library for the MSP430

MSP430 Orientation Tracker

Orientation trackers can be used for a ton of different applications: tracking mishandled packages, theft notification of valuables, and navigation are just a few examples! A recent blog post from Texas Instruments discusses how to build a low-cost and low-power orientation tracker with the MSP430.

Based on the MSP430 LaunchPad and CircuitCo’s Educational BoosterPack, the orientation tracker is very simple to put together. It can also be made wireless using any of the wireless BoosterPacks with a Fuel Tank BoosterPack, or by using the BLE Booster Pack with a built in Lithium Battery circuitry. TI provide all the necessary code and design files in their reference application for getting your orientation tracker up and running. Be sure to see the device in action after the break! This project not only involves building a low-power orientation tracker, but also showcases IQmathLib, a library of optimized fixed point math functions on the MSP430. One of the more challenging aspects of using small MCUs such as the MSP430 or Arduino is how inefficient built in math libraries are. Check out the IQmathLib, it greatly improves upon the built in math functions for the MSP430.

It would be interesting to see this project modified to be a DIY pedometer or be used on a self-balancing robot. It would also be interesting to see the IQmathLib ported to other micros, such as the Arduino. Take a look and see how you can use this reference design in your own projects!

[Read more...]

DIY Gas Can Speakers Blast Your Tunes

Gas Can Speaker

Have you ever wanted to build your own speakers, but were a bit overwhelmed with all the information out there on cases and packaging? A recent Instructable by [Txje] goes over how to build a set of simple gas can speakers.

While using gas cans as speaker housings will not result in the best audiophile quality sound or be the cheapest option out there, it sure looks awesome, and is a great way to get started with building your own speakers. After testing out the speakers and electronics, holes in the gas cans are cut and the terminals and speakers are installed. “As an added bonus, the pour spout serves to release pressure in the speaker can. You can get everything you need for ~$69 from Amazon and/or Home Depot.” Not a bad price point for two very cool looking speakers.  Once you have built the speakers, now you can experiment with different fill material to see what results in better sound quality.

This is a simple, yet fun looking build. Something like this can make a nice gift for someone who spends a lot of time in their garage. What other crazy objects have you used for speaker enclosures?

We’re Not Joking Around; Something BIG is Coming

Hackaday Something BIG LogoCountdown timer, a special presentation on the first of this month, and now there’s been some weekly mystery posts. What are we playing at? We’re not playing. This is real.

That timer is now below the 10-day mark and with every passing minute we become more giddy about the unrelenting awesome that is to come. Want to know what we’re talking about without waiting until the end? Are you a clever person? Then you might just be able to figure it all out. Try to unlock the clues from past weeks, and hit the Freenode ##hackaday channel on IRC if you need some hints (we’re certainly not going to post spoilers here).

We wouldn’t mind some help with a whisper campaign as well. Spout your conspiracy theories, and your delight at solving our puzzles to whoever will listen. Get it right and you can do the “I told you so” thing for the rest of the…. oops, that would be telling.

Sci-Fi Contest Roundup: No Tea


In case you haven’t heard, we’re running a contest on Hackaday Projects for the best Sci-Fi build. We’re a little under two weeks until the deadline for the contest and so far there are a lot of great entries (and lots of great prizes still up for grabs).

If there’s one thing this contest has taught us, it’s that Hackaday readers have impeccable taste in their choices of books, movies, TV shows, and video games. We were surprised at how many entries there are for Hitchhiker’s Guide to the Galaxy, a series not generally known for having cool gadgets such as giant mechs, lightsabers, and other impressively awesome stuff. Here’s a roundup of the current HHGTTG submissions for the Sci-Fi contest:

Doors That Sass

roundup-robot-doorThe doors in Hitchhiker’s Guide are insufferable self-contented sentient portals programmed by the Sirius Cybernetics Corporation to love their simple lives. Upon everyone opening or closing one of these doors, they thank the person for validating their existence.

The door in [Jarrett]‘s hackerspace wouldn’t stay closed, so what better way to fix the door than with a robotic door greeter? Actually, it’s just a weight tied to a pulley that keeps the door closed with a little bit of circuitry that plays an .mp3 file when the door moves. Still, self-contented doors. [Goug] is also making one of these self-satisfied doors, but there’s not much in the way of progress.

Going Up?

sentient-elevatorThe Happy Vertical People Transporter is HHGTTG’s answer to the common elevator. Like doors, they’re also sentient, but also have ‘defocused temporal perception’ to arrive at a floor before a passenger even realizes they need a lift. [DigiGram] and [Lolla] are working on one of these sentient elevators using a webcam, OpenCV, and some AVR-based electronics.

Look Out!

peril-sensitive-glassesThe Joo Janta 200 Super-Chromatic Peril Sensitive Sunglasses allow the user to adapt to danger by blacking out a the first signs of peril. [colabot] and [minimum effective dose] realized you can just buy glasses that can be blacked out electronically in the form of active shutter glasses for a 3D TV. With a few peril sensors, they’re working on finishing up their peril sensitive sunglasses.

Remember, the Hackaday Projects Sci-Fi contest doesn’t end until April 29th. That leaves you plenty of time to enter your own build. May we suggest a Brownian motion simulation beverage?


Sniffing Vending Machine Buses

Sniffing the Multidrop Bus


We’ve talked about a variety of protocols and how to deal with them in the past. Today, [Dan] is working on sniffing vending machine Multidrop Bus. The Multidrop Bus (MDB) protocol is a standard used in vending machines to connect devices such as currency collectors to the host controller.

To connect to the bus, interface hardware is required. [Dan] worked out compliant hardware and connected it to an Arduino. With the device on the bus, [Dan] got to work on an Arduino sketch to parse the MDB data into a human-readable format. With that working, the bus can easily be sniffed over the Arduino’s serial console.

This is just the start of a more involved project. Since this protocol is used to communicate with a vending machine’s currency collector or card reader, being able to communicate it would allow him to implement his own payment methods. The plan is to augment the vending machine he operates at Vancouver Hack Space to accept Bitcoin. We’re looking forward to seeing that project unfold.